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119 <H2>Gamma Correction</H2>
122 and displayed intensities, there is a gamma correction feature in
123 Mesa. Some systems, such as Silicon Graphics, support gamma
124 correction in hardware (man gamma) so you won't need to use Mesa's
125 gamma facility. Other systems, however, may need gamma adjustment
131 Gamma correction is controlled with the <b>MESA_GAMMA</b> environment
133 Gr is the red gamma value, Gg is the green gamma value, Gb is the
134 blue gamma value and G is one gamma value to use for all three
137 The defaults are all 1.0, effectively disabling gamma correction.
142 % export MESA_GAMMA="2.0" // same gamma for R,G,B
145 The progs/demos/gamma.c program may help you to determine reasonable gamma
146 value for your display. With correct gamma values, the color intensities
152 Alex De Bruyn reports that gamma values of 1.6, 1.6 and 1.9 work well
157 Mesa implements gamma correction with a lookup table which translates
158 a "linear" pixel value to a gamma-corrected pixel value. There is a
159 small performance penalty. Gamma correction only works in RGB mode.
166 For more information about gamma correction see:
168 the Gamma FAQ</a>
270 MESA_GAMMA - gamma correction coefficients (X only)
